import 'package:flutter/material.dart';
import './scale_transition.dart';


class AnimationPractice2 extends StatefulWidget {
  const AnimationPractice2({Key? key,  this.title = 'animation2'}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<AnimationPractice2> createState() => _AnimationPractice2State();
}

class _AnimationPractice2State extends State<AnimationPractice2> with SingleTickerProviderStateMixin{
  int _counter = 0;

  late final  AnimationController  _aniController = AnimationController(vsync: this,duration: Duration(seconds: 2))..addListener(() {print('animationController forward');});

  late  Animation<Color?> _aniColor = ColorTween(begin: Colors.purpleAccent,end:Colors.blue).animate(_aniController)..addListener(_printAniColor);

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
  }

  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
    _aniController.dispose();
  }

  void _printAniColor(){
    print(_aniColor.value);
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            AnimatedContainer(duration: Duration(seconds: 1),width:200,height:200,color:Colors.primaries[_counter%Colors.primaries.length],child:null),
            AnimatedBuilder(animation: _aniController, builder: (context,child){
              return Container(
                width:200,
                height:200,
                color:_aniColor.value,
                child:null,
              );
            }),
            ElevatedButton(onPressed: (){
              _aniController.forward();
            }, child: Text('forward')),
            ElevatedButton(onPressed: (){
              _aniController.animateTo(0,duration: Duration(seconds: 3),curve: Curves.easeIn,);
            }, child: Text('animated to')),
            ElevatedButton(onPressed: (){
              // setState((){
              //   _aniController = AnimationController(vsync: this,duration: Duration(seconds: 2));
              //   _aniColor = ColorTween(begin: Colors.blue,end:Colors.purpleAccent).animate(_aniController)..addListener(() {
              //     print(_aniColor.value);
              //   });
              //   _aniController.forward();
              // });

              // _aniColor.removeListener(_printAniColor);
              _aniController.removeListener(_printAniColor);
              _aniColor = ColorTween(begin: _aniColor.value,end:Colors.primaries[_counter%Colors.primaries.length]).animate(_aniController)..addListener(_printAniColor);
              _aniController.reset();
              _aniController.forward();


            }, child: Text('change')),
            ElevatedButton(onPressed: (){
              Navigator.of(context).push(MaterialPageRoute(builder: (context){
                return ScaleTransitionDemo();
              }));
            }, child: Text('scale transition'))
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}
